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60 lines
2.4 KiB
ArmAsm
60 lines
2.4 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.internal.h"
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// Returns log(𝟷+𝑥).
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//
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// @param 𝑥 is double scalar in low half of %xmm0
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// @return double scalar in low half of %xmm0
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log1p: push %rbp
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mov %rsp,%rbp
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.profilable
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push %rax
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movsd %xmm0,(%rsp)
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fldl (%rsp)
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fld %st
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fabs
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fldt .LC16(%rip)
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fxch
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fcomip %st(1),%st
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fstp %st
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jnb 1f
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fldln2
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fxch
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fyl2xp1
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fstpl (%rsp)
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movsd (%rsp),%xmm0
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0: leave
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ret
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1: fld1
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faddp %st,%st(1)
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fldln2
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fxch
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fyl2x
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fstpl (%rsp)
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movsd (%rsp),%xmm0
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jmp 0b
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.endfn log1p,globl
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.rodata.cst16
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.LC16: .long 0x0c4336f8
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.long 0x95f61998
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.long 0x3ffd
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.long 0
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